<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        ul {
            color: blue;
        }   
        #a{
            color: black;
         }
        ol {
            color: yellow;
        }
        ol li {
            color: red;
        }
        *{
            color: #000;
        }
      
    </style>
</head>
<body>
    <ul>
        <li>列表一</li>
        <li id="a">列表二 </li>
        <li>列表三</li>
    </ul>
    <ol>
        <li>有序列表一</li>
        <li>有序列表二</li>
        <li>有序列表三</li>
</body>
</html>